Abstract
Fabrication of La0,9Ca0,1FeO3 thick film ceramics using Fe2O3 powder extracted from yarosite mineral as ethanol gas sensor has been successfully performed. Fe2O3 powder extracted from yarosite mineral as the basic material in this research can increase the added value yarosite mineral. Fe2O3 powder and 10% mol of CaO dissolved in HCl were mixed with LaCl3.7H2O powder dissolved in aquades.The solution of Fe2O3, LaCl3.7H2O and CaO mixed and then precipitate using NH4OH. The La0,9Ca0,1FeO3 precipitate was calcined at temperature 8000C for 2 hours to produce La0,9Ca0,1FeO3 powder. La0,9Ca0,1FeO3 powder was crushed and mixed with Organic Vehicle to produce a La0,9Ca0,1FeO3 paste. Using the screen printing technique, the La0,9Ca0,1FeO3 paste is coated on the alumina substrate and then fired at 600°C for 2 hours to produce the thick film ceramic La0,9Ca0,1FeO3. Based on XRD and SEM characterization data, the thick film ceramics La0,9Ca0,1FeO3 were made even though some of Fe2O3 did not react and the grain size is almost uniform, and there are many pores. Measurement of electrical characteristics shows a good response to the presence of ethanol gas, has high electrical sensitivity value and low optimum working temperature that is in the range 290°C - 295°C.
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